Prosthetic joint collar



FIG. 1 is a perspective view of a prosthetic joint collar showing my new design;

FIG. 2 is a side elevation thereof;

FIG. 3 is a front elevation thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a prosthetic joint collar, as shown and described. 